Subnet

[Gregory Thomas]

Does HP-UX 11.0 support a zero subnet?

[Steven Sim Kok Leong]

Hi,

# ndd -set /dev/ip ip_check_subnet_addr 0

Remember to hardcode this in /etc/rc.config.d/nddconf for permanent change.

Hope this helps. Regards.

Steven Sim Kok Leong

[Patrick Wallek]

A 0 subnet is not supported as it is a violation of RFC-1122. You can turn off the function that does the IP subnet checking though. This is discussed in TKB document KBRC00001356 whic is attached.

[Gregory Thomas]

Thanks for the reply Steven.
ip_check_subnet_addr is an HP unsupported parameter. What is the possible fallout from me modifying that parameter?

[Patrick Wallek]

The fallout I can see is if you have someting go wrong and you call HP support and it comes to light that you have that parameter set, then they may not help you, depending on the problem.

[Gregory Thomas]

Patrick,
That doc doesn't address HP-UX 11.0. Is there something new/different/more forgiving in 11.0?

[Patrick Wallek]

That document, as far as I know, is a general document.

I don't think anything has changed with 11.0 as far as the networking support goes. I am pretty sure HP still goes according to the rules of the RFC, but, as an unsupported option, gives you the option to break the rules.

[Patrick Wallek]

Have a look at the "Installing and Administering LAN/9000 Software" manual here:
http://docs.hp.com/hpux/onlinedocs/B2355-90725/B2355-90725.html

Specifically look at the "Network Addressing" section. I think you should find all the information you need there.

This manual is relevant to HP-UX 10.X and 11.X.